Why doesn't Stack Overflow track the number of days that I've visited the site? I remain logged in from my home PC and log in from my phone, tablet, and work PC, but the consecutive days visited count ...

I have just received a notification saying that I have earned a badge for having logged in for 30 consecutive days. The fact is, I haven't done that. Is there something weird going on? Is there a way ...

Before 3-4 weeks for some wrong review I was banned for 2 days and here in some posts I can see that user can be banned up to 7 days also.
Can someone please tell me how banned days are calculated?
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